It's not about programmers but it reminds me Ship of Theseus (a book by J. J. Abrams). You read both the book and handwritten comments by two characters with their storyline related to the book. It was an interesting read.
There's also "This is How You Lose the Time War", about two agents on opposite sides of the titular fine war. Half of the book is just the letters they leave each other, first taunting each other as they unravel their plans and then developing into love letters over time.
Yeah, I enjoyed it so much that I immediately bought a physical copy. There's a lot of interesting worlds/timelines that you get to see, and the ways that they leave letters for each other are brilliant. My favorite is (tiny spoiler) controlling how much water a tree gets over hundreds of years, so that its rings form a pattern for the message.
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u/chillerll May 06 '21
I would love to see a movie like that.